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/*
* Copyright © 2019 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/**
* \file
*
* Lower image operations by turning the image_deref_* into a image_* on an
* index number or bindless_image_* intrinsic on a load_deref of the previous
* deref source. All applicable indicies are also set so that fetching the
* variable in the backend wouldn't be needed anymore.
*/
#include "compiler/nir/nir.h"
#include "compiler/nir/nir_builder.h"
#include "compiler/nir/nir_deref.h"
#include "compiler/glsl/gl_nir.h"
static void
type_size_align_1(const struct glsl_type *type, unsigned *size, unsigned *align)
{
*size = 1;
*align = 1;
}
static bool
lower_impl(nir_builder *b, nir_instr *instr, bool bindless_only)
{
if (instr->type != nir_instr_type_intrinsic)
return false;
nir_intrinsic_instr *intrinsic = nir_instr_as_intrinsic(instr);
nir_deref_instr *deref;
nir_variable *var;
switch (intrinsic->intrinsic) {
case nir_intrinsic_image_deref_atomic_add:
case nir_intrinsic_image_deref_atomic_imin:
case nir_intrinsic_image_deref_atomic_umin:
case nir_intrinsic_image_deref_atomic_imax:
case nir_intrinsic_image_deref_atomic_umax:
case nir_intrinsic_image_deref_atomic_and:
case nir_intrinsic_image_deref_atomic_or:
case nir_intrinsic_image_deref_atomic_xor:
case nir_intrinsic_image_deref_atomic_exchange:
case nir_intrinsic_image_deref_atomic_comp_swap:
case nir_intrinsic_image_deref_atomic_fadd:
case nir_intrinsic_image_deref_load:
case nir_intrinsic_image_deref_samples:
case nir_intrinsic_image_deref_size:
case nir_intrinsic_image_deref_store: {
deref = nir_src_as_deref(intrinsic->src[0]);
var = nir_deref_instr_get_variable(deref);
break;
}
default:
return false;
}
bool bindless = deref->mode != nir_var_uniform || var->data.bindless;
if (bindless_only && !bindless)
return false;
b->cursor = nir_before_instr(instr);
nir_ssa_def *src;
if (bindless) {
src = nir_load_deref(b, deref);
} else {
src = nir_iadd_imm(b,
nir_build_deref_offset(b, deref, type_size_align_1),
var->data.driver_location);
}
nir_rewrite_image_intrinsic(intrinsic, src, bindless);
return true;
}
bool
gl_nir_lower_images(nir_shader *shader, bool bindless_only)
{
bool progress = false;
nir_foreach_function(function, shader) {
if (function->impl) {
nir_builder b;
nir_builder_init(&b, function->impl);
nir_foreach_block(block, function->impl)
nir_foreach_instr(instr, block)
progress |= lower_impl(&b, instr, bindless_only);
}
}
return progress;
}
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